GINDIN: продукция Drumet (Друмет) в России

TECHNOLOGICAL INFORMATION Construction of wire rope Construction of wire rope: 1- fibre core of the rope; 2 -rope strand; 3 - central core wire; 4 - strand wires Double twisted wire rope: 1 - the rope; 2 - fibre core of the rope; 3 - rope strand; 4 - central core wire; 5 - strand wires Wire rope structure Steel wire rope consists of the strands and core. The rope core may be either fibre or wire. The core role in the rope is, first of all, to support rope strands, and it also is so called lubricant tank, as well as it is responsible for proper rope shape. Fibre cores may be produced either of plant fibres - sisal or cotton (DRUMET Ropes and Wires sp. z o.o. does not produce rope cores of other fibres) or man-made fibres - polypropylene ones. Most often, wire cores are made in the form of the rope, structure 7x7, nor so often the strand of the same structure as wire rope strands is used for rope core, and, rarely, the independent rope of other structure is a core of a rope. Comparing with fibre cores, wire cores ensure higher resistance of the rope for transversal pressures, higher resistance to exposed temperatures, higher breaking force and larger rope stiffness. What means a non-rotating rope? In the conventional rope, the external load creates the torque, which untwists the rope and rotates the load. Non-rotating ropes are produced of, at least, two layers of strands, where the inner rope layer (or layers) is laid in the direction opposite to the direction of outer rope layer strands. Such rope structure causes that, under the load, the inner rope part - that is, the rope layer, which is an independent rope - tries to spin the rope in one direction, and outer rope strands tries to spin the rope in opposite direction. In the production process, such situation should be achieved, where both torques mentioned above compensate each other within the wide range of loads to ensure operation at large lifting heights without spinning of the rope and load.